M&M. Known as "m&m". They are colourful button-shaped chocolates.

--M&M. Known as "******** *******" He (Sorry,  I mean "it") has limited colour, not including clothes.--

Produced by Mars, Incorporated, and similar to, and inspired by Smarties.

--Produced by humans I've never met. Similar to, and inspired by boys.--

The candy shell, each of which has the letter "m" printed in lower case on one side, surrounds a filling which varies depending upon the variety of M&M's.

--I shouldn't even do this one XD In fact, for your sake, I'm stopping this, but you may read what Wikipedia wrote about m&m's:

The original candy had a milk chocolate filling which, upon introducing other variations, was branded as the "plain" variety.

"Peanut" M&M's, which feature a peanut coated in milk chocolate, and finally a candy shell, were the first variation to be introduced, and they remain a regular variety.

Numerous other variations have been introduced, some of which are regular widespread varieties (such as peanut butter, almond, pretzel, crispy, and dark chocolate), while others are limited in duration or geographic availability.